Inner Horse Reef.  This reef lies Se. 3/4 E 1 1/2 miles from the eastern ear of isle au Haute.  There is a shoal here of 25 fathoms about 1/8 mile in diameter.  From this the water gradually deepens to NE. for 1/2 mile, where it drops off into the mud.  Depths on this northeast portion are about 35 fathoms.  The bottom is of pebbles and gravel.  In spring and fall this is a good cod ground.  Hake are found close to the edge in summer.  Fishing is by small craft, generally, using trawl and handline.  It is a good lobster ground.  Marks:  Bring Blue Hill Mountain in the saddle of White Horse; Brimstone showing between Western Ear and Isle au Haute.

Outer Horse Reef.  This is a short distance SW. from the Inner Reef, with only a narrow gully between.  The small shoal falls off rapidly on all sides.  It has a depths of 30 fathoms.  Over a space 1/4 mile in diameter the bottom is gravelly.  Seasons and species are as on Inner Horse Reef.

Hake Ground.  North of Monhegan island lies a patch called the Hake Ground or Mud Channel, the first name because of the abundance of hake taken here during June, July, and August.  It extends from just outside White Head to abreast of Monhegan Island on the northern side.  The depths vary from 20 to 45 fathoms, and the ground is still considered one of the best hake grounds alongshore.  It is fished by small boats and vessels when the dogfish are on the outer grounds.  This is a good haddock ground in December and January, as well as a good lobster ground.

Southwest Ground.  This lies 2 miles SW. from the western head of Isle au Haute.  It is circular in form, 1/2 mile in diameter and has a gravelly bottom with depths varying from 35 to 40 fathoms.  It is a cod ground from April to June and from September to November, inclusive.  A few pollock and haddock are taken with the cod.  Hake are abundant in summer close to Isle au Haute.  Handlines and trawls are used in the fishing.  It is also a good lobster ground.

Barley Hill Ground.  This ground lies NNE. from Seal Island and SSW from the western head of Isle au Haute directly in line between the two, about 3 1/2 miles distant from each point.  It is circular in form, has 28 to 30 fathoms of water, and the bottom is mixed mud and rocks.  This is a ground much resorted to by sloops and larger vessels, and the fishing is by hand line and trawls.  It is a good cod ground in spring and fall and a hake ground on the mud and rocks in summer.  Occasionally a few halibut are taken here during June and July.  It is also a lobster ground.

Gilkey Ground.  This bears S. from the western head of Isle au Haute. 4 miles distant.  It extends ENE. and WSW about 1 1/2 miles long by 1/3 mile wide.  The bottom is rocky on the shoals where depths are about 23 fathoms sloping to 35 fathoms on the southwest part., where the bottom is gravelly and comparatively smooth.

This is a cod ground in spring and fall, a haddock ground in winter, and hake are taken on the edges in summer.  Vessels fishing here are mostly from Maine ports.  It is also a good lobster ground.